What is the puddle of water around the spa?
The water could be from condensation on the cover, or simply from users getting in and out of the spa. Mark a starting point of the spa water level and keep track of it for a day to see how much water you are losing. This will help you determine if you should have a leak. Always check your filter lid after changing the filter to assure that it is installed correctly. An improperly seated O-ring can often times cause this puddling.